| 摘要 |
By a method of preparing a lithographic printing plate having exposing a lithographic printing plate precursor including a photosensitive layer containing (A) a polymerization initiator, (B) a polymerizable compound, (C) a sensitizing dye and (D) a binder polymer and a protective layer in this order on a hydrophilic support with laser and then removing the protective layer and an unexposed area of the photosensitive layer in the presence of a developer, in which the developer is a developer which has pH of from 2 to less than 10 and contains an amphoteric surfactant and a nonionic surfactant having an alkylene oxide chain, a simple processing of one solution and one step which does not require a water washing step becomes possible, excellent development property is achieved and a lithographic printing plate which has good printing durability and does not cause printing stain can be provided. |
| 主权项 |
1. A method of preparing a lithographic printing plate comprising: exposing a lithographic printing plate precursor comprising a photosensitive layer containing (A) a polymerization initiator, (B) a polymerizable compound, (C) a sensitizing dye and (D) a binder polymer and a protective layer in this order on a hydrophilic support with laser; and then removing the protective layer and an unexposed area of the photosensitive layer in the presence of a developer, wherein:
the developer is a developer which has pH of from 2 to less than 10 and contains an amphoteric surfactant and a nonionic surfactant having an alkylene oxide chain; the amphoteric surfactant is at least one amphoteric surfactant represented by the following formula (1) or (2):wherein, in the formula (1), R1 represents an alkyl group having from 8 to 20 carbon atoms or an alkyl group having a connecting group which has from 8 to 20 carbon atoms in total, R2 and R3 each independently represents an alkyl group or a group containing an ethyleneoxide group, R4 represents a single bond or an alkylene group, and two groups of R1, R2, R3 and R4 may be combined with each other to form a ring structure;
and in the formula (2), R11 represents an alkyl group having from 8 to 20 carbon atoms or an alkyl group having a connecting group which has from 8 to 20 carbon atoms in total, R12 and R13 each independently represents a hydrogen atom, an alkyl group or a group containing an ethyleneoxide group, R14 represents a single bond or an alkylene group, and two groups of R11 , R12 , R13 and R14 may be combined with each other to form a ring structure; and the nonionic surfactant having an alkylene oxide chain is at least one nonionic aromatic ether surfactant represented by the following formula (3):
X—Y—O-(A)n-(B)m—H (3) wherein, in the formula (3), X represents an aromatic group, Y represents single bond or an alkylene group having from 1 to 10 carbon atoms, A and B, which are different from each other, each represents —CH2CH2O— or —CH2CH(CH3)O—, and n and m each represents an integer from 0 to 100, provided that the sum of n and m is 2 or more. |
